DBCO-PEG13-DBCO

DBCO-PEG13-DBCO is a bifunctional polyethylene glycol (PEG) linker bearing two cyclooctyne (DBCO) groups, designed for copper-free strain-promoted azide–alkyne cycloaddition (SPAAC). The extended PEG spacer improves solubility and helps reduce steric constraints when conjugating biomolecules, nanoparticles, or polymeric platforms. This reagent is widely used in click chemistry workflows where orthogonal, rapid, and catalyst-free labeling is required for building multivalent constructs such as dual-functional probes, crosslinked materials, and modular biomaterial surfaces.

1. Dual-DBCO Crosslinking

DBCO-PEG13-DBCO is used to generate multivalent linkages between azide-bearing partners, enabling controlled crosslinking of biomolecule conjugates, polymer networks, and hydrogel-like materials. The two DBCO termini allow formation of higher-order architectures from azide-functional components while the PEG13 spacer provides flexibility that can preserve binding or accessibility of the azide-bearing moieties. Researchers commonly employ this reagent to tune network density and spacing in material science and chemical biology studies that rely on click-built scaffolds.

2. Multivalent Probe Conjugation

DBCO-PEG13-DBCO supports the construction of multivalent imaging and detection probes by linking two azide-functional handles onto a single PEGylated backbone. This format is particularly valuable when a probe must present multiple reactive sites for downstream coupling, such as attaching fluorophores, affinity tags, or surface-anchoring groups in a modular manner. In molecular imaging reagent development and assay development, the bifunctional DBCO design helps improve conjugation efficiency and reproducibility across parallel probe batches.

3. Surface Functionalization Platforms

DBCO-PEG13-DBCO is applied to functionalize azide-containing surfaces and coatings, including polymer films, bead-based supports, and engineered biomaterial interfaces. The PEG spacer enhances wetting and reduces nonspecific interactions in many surface chemistry workflows, while the dual DBCO groups provide robust opportunities for stable attachment to azide-functional substrates. This approach is frequently used in chemical biology and biomaterials laboratories to create reusable platforms for immobilizing capture reagents, labeling reagents, or modular assay components.

4. Nanoparticle and Polymer Assembly

DBCO-PEG13-DBCO is commonly used to assemble nanoparticle conjugates and polymer–nanoparticle hybrids by bridging azide-functional building blocks through SPAAC. The bifunctional nature supports formation of well-defined multiconjugate structures, while the PEG13 chain helps maintain colloidal compatibility and reduces aggregation during conjugation and subsequent handling. Teams working on materials-enabled diagnostics research tools and label-free/label-based assay components often select this reagent to create consistent conjugation architectures across diverse particle types and polymer carriers.